Practical, evidence-based feeding guide for adult British Shorthairs: calories, macros, portion control, HCM considerations, interactive feeding and weight management.

Nutritional Snapshot

• Typical adult weight range: 4–7 kg (8.8–15.4 lb); many adults are on the heavier side due to breed conformation.
• Maintenance energy (example): RER = 70 × weight(kg)^0.75; neutered indoor cat MER ≈ 1.0–1.4 × RER. Example: 5 kg cat RER ≈ 234 kcal/day → MER ≈ 280 kcal/day (neutered indoor).
• Target macronutrient distribution (calorie basis): Protein 35–50% kcal, Fat 30–40% kcal, Carbohydrate <15% kcal (lower is better), Dietary fiber 3–8% (DM basis) for satiety.
• Key micronutrients/supplements: Taurine (essential), arginine, arachidonic acid, vitamin A/D, calcium/phosphorus balance, EPA/DHA (omega-3), L‑carnitine (under veterinary guidance).
• Special needs: Prone to weight gain/obesity, obesity-linked diabetes, and possible hypertrophic cardiomyopathy (HCM) — focus on lean mass preservation and cardiac-safe strategies.

Overview

Consult your veterinarian or a board-certified veterinary nutritionist for personalized dietary recommendations.

Energy needs: How many calories?

• RER = 70 × (body weight in kg)^0.75 (kcal/day).
• Typical multipliers: 1.0–1.2 × RER for sedentary/neutered indoor cats; 1.2–1.4 × RER for more active adults. Use the lower end for British Shorthairs prone to obesity.

• 4 kg cat: RER ≈ 70 × 4^0.75 ≈ 198 kcal → MER ≈ 198–238 kcal/day.
• 5 kg cat: RER ≈ 234 kcal → MER ≈ 234–280 kcal/day.
• 7 kg cat: RER ≈ 312 kcal → MER ≈ 312–375 kcal/day.

Sources: NRC energy equations and AAFCO feeding guidelines (see references).

Macronutrient goals (practical guidance)

• Protein: 35–50% of calories. High-quality animal protein preserves lean mass during calorie restriction. AAFCO adult minimum protein is 26% (DM basis) — aim higher for optimal maintenance.
• Fat: 30–40% of calories. Provides energy and palatability; essential fatty acids (linoleic acid, arachidonic acid) are required.
• Carbohydrate: Keep as low as practical (<15% kcal). Cats metabolize protein/fat preferentially; high-carb diets are linked to weight gain and glucose dysregulation.
• Fiber: 3–8% on a dry-matter basis; soluble fiber can increase satiety and slow gastric emptying in weight-management diets.

Key micronutrients and supplements

• Taurine: Essential amino acid — must be present in adequate amounts. Commercial diets meeting AAFCO standards will include taurine.
• Arginine, B vitamins (esp. B12), vitamin A (preformed retinol for cats), vitamin D, calcium and phosphorus: balanced to meet NRC/AAFCO requirements.
• Omega-3 fatty acids (EPA/DHA): Low-dose supplementation (from fish oil) can support cardiovascular health and inflammatory modulation. Discuss dosage with your vet/cardiologist if HCM is present.
• L‑carnitine: Sometimes used in supervised weight-loss diets to support fat mobilization and preserve lean mass.
• Sodium: In asymptomatic HCM, routine sodium restriction is not universally recommended; in congestive heart failure, sodium restriction may be needed. Always follow cardiology guidance.

HCM-specific nutritional considerations

• Maintain ideal body condition: obesity worsens cardiac workload; weight loss should be slow and supervised.
• Ensure adequate taurine and essential fatty acids. While taurine deficiency causes dilated cardiomyopathy rather than HCM, adequate levels are still vital.
• Omega‑3s (EPA/DHA): may benefit myocardial health and reduce inflammation — discuss appropriate dosing with your veterinarian or veterinary cardiologist.
• Avoid abrupt electrolyte or fluid changes. If your cat has heart failure signs, follow a cardiologist's guidance on sodium, fluid, and diuretic-related feeding adjustments.

Feeding schedule and portion control

• Avoid free-choice ad lib dry feeding for adult British Shorthairs due to obesity risk.
• Measured meals 2–3 times daily (morning and evening minimum) provide better portion control and predictable calorie intake.
• For weight management, feed 2 measured meals/day or multiple small meals with portioned daily calories rather than free access.
• Use a kitchen scale for accuracy. Measuring by weight (grams) is much more reliable than volume cups.
• Recheck body weight and body condition score (BCS) every 2–4 weeks during adjustments; aim for slow, steady changes.

• Use food puzzles for dry kibble portions or hide small wet-food servings in safe puzzle toys.
• Rotate puzzle types and place food stations at varying heights to encourage mild climbing and exploration.

Foods to include and avoid

• High-protein wet foods (look for >40% kcal from protein or high-quality animal protein sources). Wet diets increase water intake and satiety.
• Veterinary therapeutic weight-loss formulas (high protein, moderate fat, added fiber, L‑carnitine when indicated).
• Limited-ingredient novel protein diets only if food allergies suspected and diagnosed.
• Controlled amounts of lean cooked meats for top-offs (account for calories). Avoid raw unless tested and under guidance.

• Onions, garlic, chives (toxic)
• Grapes/raisins (kidney injury risk)
• Chocolate, caffeine
• Xylitol-containing foods (sweeteners)
• Cooked bones (splinter risk), raw bones (infection risk)
• Large amounts of dairy (lactose intolerance)
• High-sodium human foods, deli meats

Sample daily feeding guideline (example calculations)

Example cat: neutered 5 kg British Shorthair, sedentary

• RER ≈ 234 kcal/day. Use MER multiplier 1.2 → MER ≈ 280 kcal/day.
• If feeding a canned diet that is 90 kcal per 100 g: 280 kcal ÷ 0.9 kcal/g ≈ 311 g wet/day → divide into 2 meals ≈ 155 g per meal.
• If feeding dry kibble that is 380 kcal/cup: 280 ÷ 380 ≈ 0.74 cup/day → measured into 2 meals ~0.37 cup per meal.

Practical meal plan ideas

• Maintenance (5 kg example): Morning — 155 g canned high-protein diet; Evening — 155 g canned. Add interactive feeding toys for 1–2 small portions of kibble (included in daily calories).
• Weight-management approach: Switch to a veterinary weight-loss canned formula, feed total daily calories equal to prescribed target (e.g., 220 kcal/day) split into 2–3 meals, include puzzle feeding twice daily.

Transitioning to a new diet

• Transition over 7–10 days: start with 75% old diet/25% new for 2–3 days, then 50/50 for 2–3 days, then 25/75 for 2–3 days, then 100% new.
• Watch for vomiting, diarrhea, or inappetence—slow the transition if GI signs appear.
• For therapeutic diets (weight loss, cardiac), a veterinary-supervised transition is recommended.

Signs your diet is working

• Stable weight within target range or gradual loss if on a weight plan (~0.5–2% body weight/week).
• Body condition score in the ideal range (5/9 commonly for many systems) while maintaining muscularity.
• Healthy, shiny coat and normal energy levels.
• Normal stool consistency and regular bowel movements.
• No excessive hunger or begging once adjusted (some temporary increased begging early during caloric restriction is common).

Red flags — when to adjust or seek help

• Rapid weight gain or failure to lose weight despite calorie control.
• Loss of muscle mass (sagging flanks, prominent spine/ribs while fat remains) — indicates insufficient protein.
• Marked changes in appetite (anorexia or polyphagia), vomiting, diarrhea.
• Excessive thirst and urination (could signal diabetes or other metabolic disease).
• Lethargy, exercise intolerance, respiratory distress, coughing — if HCM or heart failure signs are suspected, seek immediate veterinary care.

Monitoring and follow-up

• Weigh the cat every 1–2 weeks during dietary changes; then monthly when stable.
• Record food intake and any treats — small extras add up quickly.
• Reassess body condition score and muscle condition score with your veterinarian at regular visits.

Evidence base and recommendations

• Use diets that meet AAFCO adult maintenance nutrient profiles or those formulated using NRC nutrient recommendations. WSAVA and veterinary nutrition texts (eg, Small Animal Clinical Nutrition) emphasize appropriate protein for adult cats and cautious, supervised weight loss.
• For HCM, follow your cardiologist's and veterinarian's recommendations — nutritional changes can help but must be individualized.

Quick checklist for British Shorthair owners

• Measure meals by weight with a kitchen scale.
• Prefer wet, high-protein diets for satiety and hydration.
• Use interactive feeders/puzzles to slow intake and increase activity.
• Monitor weight and body condition regularly; aim for slow, steady adjustments.
• Coordinate any cardiac-related nutrition changes with your veterinarian/cardiologist.

References and further reading

• WSAVA Global Nutrition Committee Guidelines
• AAFCO Official Publication: Statements of Nutrient Profiles for Cats
• National Research Council (NRC) Nutrient Requirements of Cats
• Hand, M. S., et al. (eds.) Small Animal Clinical Nutrition (textbook)

Frequently Asked Questions